A lot of effective functional testing is getting fixtures ready so that your test can reliably hit the important part of the system under test. For external in

A lot of effective functional testing is getting fixtures ready so that your test can reliably hit the important part of the system under test. For external integrations this becomes difficult. Presumably your test uses the api sandbox, so hopefully it gives reproducible results. If not, then you need to test manually and focus on unit testing to assure the software.